Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Accordingly the most prominent chiefs of the defeated parties were indeed removed, but full pardon was not withheld from the men of the second and third rank and especially of the younger generation; they were not, however, allowed to sulk in passive opposition, but were by more or less gentle pressure induced to take an active part in the new administration, and to accept honours and offices from it. As with Henry the Fourth and William of Orange, so with Caesar his greatest difficulties began only after the victory.
Every revolutionary conqueror learns by experience that, if after vanquishing his opponents he would not remain like Cinna and Sulla a mere party-chief, but would like Caesar, Henry the Fourth, and William of Orange substitute the welfare of the commonwealth for the necessarily one-sided programme of his own party, for the moment all parties, his own as well as the vanquished, unite against the new chief; and the more so, the more great and pure his idea of his new vocation.
The friends of the constitution and the Pompeians, though doing homage with the lips to Caesar, bore yet in heart a grudge either at monarchy or at least at the dynasty; the degenerate democracy was in open rebellion against Caesar from the moment of its perceiving that Caesar's objects were by no means its own; even the personal adherents of Caesar murmured, when they found that their chief was establishing instead of a state of condottieri a monarchy equal and just towards all, and that the portions of gain accruing to them were to be diminished by the accession of the vanquished.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=24